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CN109691119A - Image display system and image display method - Google Patents

Image display system and image display method Download PDF

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Publication number
CN109691119A
CN109691119A CN201880003484.1A CN201880003484A CN109691119A CN 109691119 A CN109691119 A CN 109691119A CN 201880003484 A CN201880003484 A CN 201880003484A CN 109691119 A CN109691119 A CN 109691119A
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CN
China
Prior art keywords
tone mapping
mentioned
image
image display
brightness
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Granted
Application number
CN201880003484.1A
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Chinese (zh)
Other versions
CN109691119B (en
Inventor
山本雅哉
小塚雅之
柏木吉一郎
西尾岁朗
甲野和彦
矢羽田洋
广田健
森美裕
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Publication of CN109691119A publication Critical patent/CN109691119A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration using local operators
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/90—Dynamic range modification of images or parts thereof
    • G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/44504—Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/793—Processing of colour television signals in connection with recording for controlling the level of the chrominance signal, e.g. by means of automatic chroma control circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10016—Video; Image sequence
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20004—Adaptive image processing
    • G06T2207/20008—Globally adaptive
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20172—Image enhancement details
    • G06T2207/20208—High dynamic range [HDR] image processing

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Graphics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Studio Circuits (AREA)

Abstract

影像显示系统(100)具备：色调映射处理部(123)，进行色调映射处理，该色调映射处理使用与影像的最大亮度对应的变换曲线对上述影像的亮度进行变换；以及显示部(124)，显示上述色调映射处理后的影像；上述色调映射处理部(123)对是进行第1色调映射处理还是进行第2色调映射处理进行切换，该第1色调映射处理根据上述影像的最大亮度的时间序列的变化，按时间序列变更上述变换曲线，该第2色调映射处理与上述影像的最大亮度的时间序列的变化无关地使用一定的变换曲线。

The image display system (100) comprises: a tone mapping processing unit (123) for performing tone mapping processing, wherein the tone mapping processing uses a transformation curve corresponding to the maximum brightness of the image to transform the brightness of the image; and a display unit (124) for displaying the image after the tone mapping processing; the tone mapping processing unit (123) switches between performing a first tone mapping processing or a second tone mapping processing, wherein the first tone mapping processing changes the transformation curve in a time series according to the time series change of the maximum brightness of the image, and the second tone mapping processing uses a certain transformation curve regardless of the time series change of the maximum brightness of the image.

Description

Image display system and image display method
Technical field
This disclosure relates to show the image display system and image display method of image.
Background technique
In patent document 1, describe in HDR (High Dynamic Range: high dynamic range) image The method and system of mapped graphics on image.
Existing technical literature
Patent document
Patent document 1: No. 6104411 specifications of Japanese Patent No.
Non-patent literature
Non-patent literature 1:White Paper Blu-ray Disc Read-Only Format (Ultra HD Blu-ray), Audio Visual Application Format Specifications for BD-ROM Version 3.1, August 2016, http://www.blu-raydisc.com/Assets/Downloadablefile/BD-ROM_ Part3_V3.1_WhitePaper_160729_clean.pdf
Summary of the invention
Subject to be solved by the invention
Purpose of this disclosure is to provide a kind of image display system of the quality of image that can be improved display or image are aobvious Show method.
For the means to solve the problem
The image display system of a technical solution in relation to the disclosure has: tone mapping processing unit, carries out tone mapping Processing, tone mapping processing become the brightness of above-mentioned image using conversion curve corresponding with the maximum brightness of image It changes；And display unit, show above-mentioned tone mapping treated image；Above-mentioned tone mapping processing unit to be carry out the 1st tone Mapping processing or progress the 2nd tone mapping processing switch over, and the processing of the 1st tone mapping is according to the most light of above-mentioned image Above-mentioned conversion curve is changed in the variation of the time series of degree in temporal sequence, and the processing of the 2nd tone mapping and above-mentioned image are most The variation of the time series of big brightness independently uses certain conversion curve.
Invention effect
The disclosure is capable of providing image display system or the image display side of a kind of quality of image that can be improved display Method.
Detailed description of the invention
Fig. 1 is the figure for illustrating the evolution of image technology.
Fig. 2 is for illustrating making video when importing new Findings to content (content), published method and aobvious The figure of the relationship of showing device.
Fig. 3 A is the figure for indicating an example of tone mapping (tone mapping).
Fig. 3 B is the figure for indicating an example of tone mapping.
Fig. 4 A is the figure for indicating an example of static tone mapping.
Fig. 4 B is the figure for indicating an example of dynamic tone mapping.
Fig. 5 is the figure for the example for indicating superposed graph on a moving image and showing.
Fig. 6 is the figure for indicating the influence of the dynamic tone mapping when being superimposed figure in main image.
Fig. 7 is the block diagram of the image display system in relation to embodiment 1.
Fig. 8 A is the figure for indicating an example of main image dynamic metadata and Graphics overlay mark in relation to embodiment 1.
Fig. 8 B is the figure for indicating an example of main image dynamic metadata and Graphics overlay mark in relation to embodiment 1.
Fig. 9 is the block diagram of the tone mapping processing unit in relation to embodiment 1.
Figure 10 is the block diagram of the variation of the tone mapping processing unit in relation to embodiment 1.
Figure 11 A is the flow chart for indicating the processing of the picture reproducer in relation to embodiment 1.
Figure 11 B is the flow chart for indicating the processing of the image display in relation to embodiment 1.
Figure 12 A is to indicate main image dynamic metadata, Graphics overlay mark and figure luminance information in relation to embodiment 2 An example figure.
Figure 12 B is to indicate main image dynamic metadata, Graphics overlay mark and figure luminance information in relation to embodiment 2 An example figure.
Figure 13 A is to indicate main image dynamic metadata, Graphics overlay mark and figure luminance information in relation to embodiment 2 An example figure.
Figure 13 B is to indicate main image dynamic metadata, Graphics overlay mark and figure luminance information in relation to embodiment 2 An example figure.
Figure 14 A is the figure for indicating the previous variation by tone mapping bring brightness.
Figure 14 B is the figure for indicating the variation by tone mapping bring brightness of related embodiment 1.
Figure 15 is the figure for indicating the variation by tone mapping bring brightness of related embodiment 2.
Figure 16 is the block diagram of the tone mapping processing unit in relation to embodiment 3.
Figure 17 is the block diagram of the picture reproducer in relation to embodiment 4.
Figure 18 is the block diagram of the picture reproducer in relation to embodiment 5.
Figure 19 is the figure for indicating an example of the tone mapping in relation to embodiment 5.
Figure 20 is the figure for indicating an example of the tone map information in relation to embodiment 5.
Specific embodiment
[1-1. background]
Firstly, being illustrated using Fig. 1 to the transition of image technology.Fig. 1 is said for the evolution to image technology Bright figure.
Up to the present, as the higher image quality of image, it is mainly focused on the expansion of display pixel number, from Standard 720 × 480 pixels of Definition (SD: SD) start, 1920 × 1080 pictures of High Definition (HD: high definition) The image of element is gaining popularity.
In recent years, using further higher image quality as target, Ultra High Definition (UHD: superelevation has been started The importing of the so-called 4K image of 4096 × 2048 pixels of 3840 × 1920 pixels or 4K clearly).
While the importing of 4K, dynamic range expansion also studied, colour gamut expands or the addition or raising of frame rate Deng.
Wherein, about dynamic range, as be used to while maintaining dark portion grayscale, by cannot with existing TV signal The bright light of the specular light of performance etc. is in a manner of the brightness performance closer to reality, HDR (High Dynamic Range it) attracts attention.Specifically, TV signal up to the present be referred to as SDR (Standard Dynamic Range: Standard dynamic range), maximum brightness is 100nit.Maximum brightness is extended to 1000nit in contrast, contemplating in HDR More than.HDR is just in SMPTE (Society of Motion Picture&Television Engineers: film and TV work Association of Engineers) and ITU-R (International Telecommunications Union Radiocommunications Sector: International Telecommunication Union's radio communication group) etc. in carrying out master tape and show that (mastering display) uses standard Standardization.
As the specific application target of HDR, with HD and UHD it is also envisaged that broadcast, encapsulation medium (Blu-ray (note Volume trade mark) Disc etc.) and the Internet-distributed etc..
[relationship of 1-2. master tape (master) generation, published method and display device]
Fig. 2 is for illustrating making video from new Findings to content, published method and display device when importing The figure of relationship.
In the case where the higher image quality for image imports new Findings (increase etc. of pixel number), such as Fig. 2 It is shown, need (1) to change the master tape towards Home Entertainment (home entertaining) of making video side.With this It is corresponding, need to show the published method of (2) broadcast, communication and encapsulation medium etc. and (3) TV or projector etc. of the image Display device also update.
[1-3. tone mapping]
Tone mapping (Tone Mapping) is the maximum brightness of brightness and image display according to HDR image The relationship of (Display Peak Luminance:DPL), in maximum brightness (the Maximum Content Luminance of image Level:MaxCLL) more than DPL in the case where by the luminance transformation of image, make the brightness of image include processing within DPL. Through this process, the information near the maximum brightness of image can not be lost and shows image.It is aobvious that the transformation had both depended on image The characteristic of showing device also depends on the form of thinking how to be shown, therefore uses not according to each image display Same conversion curve.
Fig. 3 A and Fig. 3 B are the figures for indicating an example of tone mapping.Fig. 3 A indicates the case where DPL is 500nit, and Fig. 3 B is indicated The case where DPL is 1000nit.In addition, Fig. 3 A and Fig. 3 B are showing the tone in the case where the image that MaxCLL is 1000nit Map and show MaxCLL be 4000nit image in the case where tone mapping example.
As shown in Figure 3A, in the case where DPL is 500nit, by luminance transformation so which image can be 500nit or less is shown to MaxCLL, but the image of MaxCLL high, the degree of transformation are bigger.
As shown in Figure 3B, in the case where DPL is 1000nit, in the image that MaxCLL is 1000nit, without color Adjust mapping.In the image that MaxCLL is 4000nit, tone mapping is carried out, simultaneously for 1000nit by the luminance transformation of 4000nit Display.
[1-4. dynamic metadata and dynamic tone mapping]
Fig. 4 A is the figure for indicating the example of the tone mapping using static metadata.Fig. 4 B is indicated using dynamic metadata Dynamic tone mapping example figure.
As shown in Figure 4 A, using static metadata (MaxCLL), since MaxCLL is in a series of image It is interior to indicate highest brightness, so the tone mapping that a series of image can be only fixed in image display.Phase For this, shown in (a) of image display such as Fig. 4 B, by using the brightness matching with time change metadata (here Referred to as Dynamic MaxCLL), without tone mapping ((b) of Fig. 4 B), higher in brightness such as in the lower situation of brightness In the case where carry out tone mapping ((c) of Fig. 4 B) like that, can be realized the optimal tone with the brightness matching of time change Mapping.
[synthesis of 1-5. image and figure]
Fig. 5 indicates to be superimposed the figure of menu and subtitle etc., the example that is shown with image display on a moving image Figure.Here, the example of Ultra HD Blu-ray is indicated.
Moving image before superposed graph is shown as into main image.In Ultra HD Blu-ray, with HD resolution ratio Prepare figure.Picture reproducer carries out HD-UHD transformation by the figure to HD to generate the figure of UHD.Also, image is again Existing device synthesizes the figure of obtained UHD with the main image of UHD resolution ratio.Also, picture reproducer is by the shadow after synthesis As being passed via HDMI (registered trademark) (High-Definition Multimedia Interface) to image display It send.Image display shows the image that transmission comes as HDR.
In addition, brightness of the picture reproducer based on main image time change determine dynamic metadata, via HDMI to Image display transmission.Image display based on transmission come dynamic metadata, to be superimposed in main image subtitle and The video signal of menu implements dynamic tone mapping.
The feelings of HDR image of the situation in OTT (Over The Top: cross) service of the display based on broadcast or communication It is same in the case where menu or subtitle are also superimposed in main image and shows obtained image with image display under condition 's.
[1-6. carries out class in the case where dynamic tone mapping to the image data for being superimposed figure in moving image Topic]
In dynamic metadata mode, first number about brightness of Luminance Distribution of HDR image etc. is specified according to each frame According to, together with video signal by such metadata to image display transmit.Image display is shown according to the image The display capabilities of the maximum brightness of device etc. are carried out with transmitting the metadata come as reference by the processing of luminance transformation etc..In this way Though dynamic metadata mode be used as the display performance of brightness of image display etc. how all display as far as possible be certain The mode of the image of quality attracts attention.
But dynamic metadata is due to changing in time, so there is the display for the image that should be certain originally unstable The problem of.
If the image that should be shown is only the image edited or supervized simultaneously, so-called moving image, it is able to carry out To a certain degree in view of the processing of the situation of image.If using such moving image as main image, while will be certain originally And the graph data of subtitle or menu not changed completely etc. is superimposed upon in main image and shows, then by using dynamic metadata Processing, occur should be certain figure brightness or the changed adverse effect of color.The brightness of main image is higher, image The brightness of display device is lower, and the adverse effect is more significant.
Fig. 6 is the figure for indicating the influence of dynamic tone mapping when being superimposed figure in main image.Here, such as Fig. 6 (a) shown in, the brightness of the figure of superposition is assumed to 350nit.As shown in (b) of Fig. 6, in the lower area of the brightness of main image Between in, without tone mapping, figure is shown on image display using the 350nit as original brightness.Another party Face, as shown in (c) of Fig. 6, in the higher section of brightness of main image, carry out tone mapping, by the brightness of figure with than 350nit low brightness is shown on image display.In this way, the brightness that would otherwise be certain figure changes in time, As bad state.Here it is set as the influence of only brightness, but in actual image display, because of color component It is affected, so also there is the case where color is also affected.
[1-7. solution]
As the means for avoiding the above subject, it may be considered that pass the location information of the figure of superposition to image display It send, the method for making the part for only showing figure not apply dynamic metadata.But this method is in the entire area of display picture Need whether to show the transmission of the information of figure, the processing in image display is also required to the judgement under display pixel unit Deng realization is extremely difficult.
Solution below is used in the disclosure.In the 1st method, picture reproducer is as dynamic metadata Information will indicate that " Graphics overlay mark " that figure whether is superimposed in main image is transmitted to image display.As figure Shape, due to having menu and subtitle, so can also be by " menu superposition mark " as " Graphics overlay mark " picture reproducer And " subtitle superposition mark " is transmitted to image display.
Image display becomes the On/Off of dynamic tone mapping or its intensity according to the state of menu superposition mark Change.Thereby, it is possible to reduce figure from dynamic tone mapping to superposition influence.
In the 2nd method, picture reproducer is other than the 1st method, also by the letter of the maximum brightness of the figure of superposition It ceases and is transmitted as the information of dynamic metadata to image display.Mark is same with being superimposed, can also be in subtitle and menu It is separately provided maximum brightness information.
Image display can more meticulously control dynamic according to the information of the maximum brightness of Graphics overlay mark and figure State tone mapping.
In the 3rd method, image display is using interframe correlation etc., and detection is shown as certain figure, for this Part inhibits dynamic tone mapping.
In the 4th method, Ultra HD Blu-ray transcriber, broadcast receiver or Internet Broadcast receive dress The HDR picture reproducer set etc. is according to the maximum brightness information of the image display connected, by the bright of the figure of superposition Degree change, to reduce the influence of the tone mapping carried out by image display.In addition, picture reproducer can both pass through behaviour Author's sets to obtain the maximum brightness of image display, can also be by being connected on the HDMI of picture reproducer EDID is obtained from image display.
Since the method for the tone mapping of image display is various, so the adjustment of the brightness of figure can It is adjusted with certain amplitude.As the method for its adjustment, there is the method for operator's setting or filled based on being shown from each image The method etc. that the information that the database set obtains is adjusted.
In the 5th method, HDR picture reproducer assumes that display has been superimposed the image display of the HDR image of figure The method of dynamic tone mapping the dynamic tone in image display is implemented to the figure of superposition before superposed graph The inverse transformation of mapping.Superimposed figure can be carried out after implementing dynamic tone mapping as a result, with original brightness and color Display.
The method of dynamic tone mapping method as the image display for assuming connection, can be used side below Method.Picture reproducer simply, as impregnable maximum brightness, by the maximum brightness for reaching image display Such as the brightness of 90% image information correspond to.More particularly, picture reproducer can also take from database These information are obtained to correspond to.Alternatively, picture reproducer can also be measured by test pattern (pattern), based on survey Amount result is set.
By above method, passed in the Internet-distributed to encapsulation medium or OTT etc. by broadcast, Blu-ray etc. In the case that the HDR video signal sent carries out dynamic tone mapping, dynamic tone mapping can be reduced for menu or subtitle Deng figure influence.Thereby, it is possible to obtain the display of stable subtitle or menu and with the maximum brightness of image display (DPL) and the effect of the corresponding dynamic tone mapping of the maximum brightness of moving image.
In addition, it is particular enable to increase and the HDR effect in the image display of the relatively low brightness of brightness of image, On the other hand, it can be realized the display of the higher menu of same as static tone mapping quality and subtitle.
In addition, by the way that the processing of subtitle and menu is separated, can by the processing being suitble to respectively with subtitle and menu, into The influence of one step reduction dynamic tone mapping.Specifically, the brightness relative to subtitle is substantially certain brightness, menu it is bright Degree is variation.In addition, in the case where showing subtitle when main image reproduces, from initially showing subtitle to the end, and It is synchronous with main image.On the other hand, menu is only shown in the case where operation, and not synchronous with main image.Can carry out In view of the processing of the difference of the property of such subtitle and menu.
[2. embodiment 1]
In the present embodiment, picture reproducer will indicate the Graphics overlay mark that figure whether is superimposed in main image Will is implanted in a part of dynamic metadata and transmits to image display.Image display is according to Graphics overlay mark State, use the On/Off or its Strength Changes of the dynamic tone mapping of dynamic metadata.Thereby, it is possible to reduce dynamic color Adjust mapping to the influence of the figure of superposition.Graphics overlay mark can also by the display of expression subtitle with/without subtitle superposition Mark and indicate menu show with/without menu superposition mark two constitute.
[structure of 2-1. image display system]
Fig. 7 is the block diagram for indicating the structure of the image display system 100 in relation to present embodiment.Image shown in Fig. 7 is aobvious Show that system 100 includes picture reproducer 101 and image display 102.
Picture reproducer 101 is exported by image reproduction, by obtained image to image display 102.The image Transcriber 101 includes acquisition unit 111, demultiplexer 112, main image lsb decoder 113, caption decoding portion 114, menu lsb decoder 115, metadata acquisition unit 116, figure combining unit 117, main image combining unit 118 and image unloading part 119.
Acquisition unit 111 obtains video signal.For example, being obtained in the case where picture reproducer 101 is disc reproducing apparatus Portion 111 obtains video signal by that will coil to reproduce.In addition, in the case where picture reproducer 101 is broadcast receiver, Acquisition unit 111 obtains video signal by receiving broadcast wave.In addition, being that Internet Broadcast receives in picture reproducer 101 In the case where device, acquisition unit 111 obtains video signal by receiving Internet Broadcast.
Demultiplexer 112 distinguishes the main image signal, caption signal and menu signal of the coding for including in video signal It is exported to main image lsb decoder 113, caption decoding portion 114 and menu lsb decoder 115.
Main image lsb decoder 113 decodes the main image signal of the coding exported from demultiplexer 112.
Caption decoding portion 114 decodes the caption signal of the coding exported from demultiplexer 112.In addition, caption decoding portion 114 operations etc. based on user choose whether the classification of the subtitle of display subtitle and display, in the case where showing subtitle, Selected subtitle is exported to figure combining unit 117.
Menu lsb decoder 115 decodes the menu signal of the coding exported from demultiplexer 112.In addition, menu lsb decoder 115 operations etc. based on user choose whether the classification of the menu of display menu and display, in the case where showing menu, Selected dish unidirectional graphic combining unit 117 is exported.In addition, menu lsb decoder 115 can also be not only by carrying out self imaging Menu is also synthesized and is shown by the program acted in picture reproducer 101 by the information of signal.
Metadata acquisition unit 116 obtains main image dynamic metadata.For example, metadata acquisition unit 116 is believed based on main image The information for including in number generates main image dynamic data.
Figure combining unit 117 generates graphical information by constituting subtitle and menu.In addition, as described above, figure synthesis Portion 117 can also convert the resolution ratio of subtitle and menu.For example, in the case where Ultra HD Blu-ray, figure combining unit 117 are transformed to the subtitle of HD and menu the subtitle and menu of UHD.
In addition, figure combining unit 117 generates graphical information, the case where being superimposed graphical information generated to main image Under, Graphics overlay mark is set as ON, is transmitted to image unloading part 119.In addition, figure combining unit 117 is not by graphical information In the case where main image superposition, Graphics overlay mark is set as OFF, is transmitted to image unloading part 119.In addition, Graphics overlay Mark can also both be generated by the Program Generating in picture reproducer 101 by other mechanisms.
Main image combining unit 118 is given birth to by the main image that will be obtained by main image lsb decoder 113 with by figure combining unit 117 At graphical information synthesis, generate video signal.
Image unloading part 119 is by the video signal and dynamic metadata that are generated by main image combining unit 118 via HDMI wire The video signal transport mechanism of cable etc. is transmitted to image display 102.Dynamic metadata includes being taken by metadata acquisition unit 116 The main image dynamic metadata obtained and the Graphics overlay mark generated by figure combining unit 117.
Fig. 8 A be the main image dynamic metadata for indicating to transmit from picture reproducer 101 to image display 102 and The figure of the structural example of Graphics overlay mark.As shown in Figure 8 A, main image dynamic metadata indicates the maximum brightness of main image and puts down Equal brightness.For example, main image dynamic metadata indicates the maximum brightness and average brightness of 1 frame unit or multiframe unit.
Fig. 8 B is the figure for indicating other structural example of main image dynamic metadata and Graphics overlay mark.As shown in Figure 8 B, Graphics overlay mark also may include indicating whether to be superimposed with the subtitle superposition mark of subtitle in main image and indicating whether The menu superposition mark of menu is superimposed in main image.
Then, the structure of image display 102 is illustrated.Image display 102 has image receiving unit 121, metadata acquisition unit 122, tone mapping processing unit 123 and display unit 124.
Image receiving unit 121 receives the video signal come from the transmission of picture reproducer 101 and dynamic metadata.Image connects Receipts portion 121 separates video signal with dynamic metadata, and video signal is transmitted to tone mapping processing unit 123, will dynamic member Data are transmitted to metadata acquisition unit 122.The main image dynamic metadata that metadata acquisition unit 122 will include in dynamic metadata And Graphics overlay mark is transmitted as control signal to tone mapping processing unit 123.
Tone mapping processing unit 123 carries out the tone mapping processing of video signal according to main image dynamic metadata.Specifically For, tone mapping processing unit 123, according to main image dynamic metadata, carries out shadow in the case where Graphics overlay mark is OFF As the tone mapping of signal handles (processing of dynamic tone mapping).On the other hand, tone mapping processing unit 123 is in Graphics overlay mark In the case that will is ON, the tone mapping processing for reducing influence of the dynamic tone mapping to the figure of superposition is carried out.Display unit 124 display tone mappings treated video signal.
[2-2. tone mapping processing unit]
The details of tone mapping processing unit 123 is illustrated.Fig. 9 is the knot for indicating tone mapping processing unit 123 The block diagram of structure.Tone mapping processing unit 123 has coefficient operational part 131, coefficient retaining unit 132, tone mapping portion 133 and switching Portion SW1 and SW2.
The video signal for carrying out self imaging receiving unit 121 is transmitted to tone mapping portion 133.From metadata acquisition unit 122 Main image dynamic metadata transmitted to coefficient operational part 131.
Coefficient operational part 131 is calculated according to the image display capabilities of the brightness of image display 102 etc. in tone mapping Tone mapping coefficient used in the tone mapping processing in portion 133.132 retention coefficient operational part 131 of coefficient retaining unit calculates Tone mapping coefficient.Here, the tone mapping coefficient is to indicate the conversion curve used in tone mapping processing Function in include coefficient.That is, determining conversion curve by tone mapping coefficient.
Switching part SW1 selection is by the calculated tone mapping coefficient (A) of coefficient operational part 131 and is maintained at coefficient retaining unit The side in tone mapping coefficient (B) in 132 transmits selected tone mapping coefficient to tone mapping portion 133.Switching Portion SW2 is selected by calculated tone tone mapping coefficient (A) and be maintained in coefficient retaining unit 132 of coefficient operational part 131 A side in mapping coefficient (B) inputs selected tone mapping coefficient to coefficient retaining unit 132.That is, switching part SW2 is cut Change be the tone mapping coefficient update that will remain in coefficient retaining unit 132 is by the new calculated tone of coefficient operational part 131 Mapping coefficient (A), or the tone mapping coefficient currently kept is continued to keep (B).
Switching part SW1 and SW2 are interlocked, and A are connected in the case where Graphics overlay mark is OFF, in Graphics overlay Mark is connected to B in the case where being ON.As a result, in the case where being superimposed with figure, the dynamic color based on dynamic metadata Mapping is adjusted to be fixed.
In addition, in the case where Graphics overlay mark includes subtitle superposition mark and menu superposition mark, by a combination thereof, The processing of the tone mapping coefficient inputted to tone mapping portion 133 can be changed.It as an example, is ON's in subtitle superposition mark In the case of, tone mapping coefficient is fixed (switching part SW1 and SW2 are connected to B), and the feelings for being ON in only menu superposition mark Under condition, common tone mapping coefficient (switching part SW1 and SW2 are connected to A) etc. is used.
In addition, this structure is an example, tone mapping processing unit 123, both can be in the case where Graphics overlay mark is ON Tone mapping coefficient is fixed below specific brightness, it can also be handled without tone mapping.
Figure 10 is tone mapping processing unit in the case where indicating that tone mapping coefficient is fixed below specific brightness The figure of the structure of 123A.Tone mapping processing unit 123A replaces switching part SW1 and has coefficient combining unit 134.
Coefficient combining unit 134 is in the case where Graphics overlay mark is ON, for the boundary as preset brightness Brightness more than brightness carries out the processing of dynamic tone mapping, but for the brightness less than boundary luminances, carries out (1) for tone mapping Fixed, (2) inhibit the variation of tone mapping or (4) that the influence of tone mapping is become without tone mapping processing, (3) The processing of the not perceived degree of people etc..Here, the boundary luminances, e.g. most than the brightness that uses in the graphic It is worth high brightness greatly.Tone mapping is inhibited to change in the brightness range for figure as a result,.In addition, in the process above, In order to maintain the conversion curve of boundary luminances or more and the continuity of the conversion curve less than boundary luminances, coefficient combining unit 134 Conversion curve can also be corrected, so that conversion curve is smoothly varying in these borderline regions.
In addition, there is illustrated the structures only about image, subtitle and menu, but in picture reproducer 101 and image In display device 102, also audio signal etc. is handled, transmit and is exported.Because these are not related with the disclosure, including after Explanation also omit it.
In addition, in the case where Graphics overlay mark includes subtitle superposition mark and menu superposition mark, it is shown in Fig. 10 Coefficient combining unit 134 uses different synthetic methods according to the state of subtitle superposition mark and menu superposition mark.For example, Coefficient combining unit 134 is in the case that menu Composite Logo is ON the case where subtitle superposition mark is ON and only, by above-mentioned boundary Brightness settings are different values.
Coefficient combining unit 134 consider display unit 124 maximum brightness and other characteristic about image and set boundary Brightness.Here, the luminance level of usual menu is higher than the luminance level of subtitle.Coefficient combining unit 134 is superimposed in menu and marks as a result, In the case that will is ON, compared with the case where only subtitle superposition mark is ON, boundary luminances can be set to higher.
In addition, menu is to decide whether superposition according to the meaning of user, can also have and dynamic tone mapping pair The considerations of influence of menu is compared to the tone mapping for more paying attention to main image mode.Coefficient combining unit 134 can also be in only dish as a result, In the case that single superposition mark is ON, boundary luminances are set to compared with the case where subtitle superposition mark is ON lower.
[movement of 2-3. image display system]
Illustrate the flowing of the movement of image display system.Figure 11 A is the process for indicating the movement of picture reproducer 101 Figure.Picture reproducer 101, according to the processing status of figure (subtitle and menu), determines in master after the reproduction for starting image Whether figure (S101) is superimposed in image.In the case where being superimposed with figure in main image ("Yes" in S101), image reproduction Graphics overlay mark is set as ON (S102) by device 101.On the other hand, in the case where figure is not superimposed in main image ("No" in S101), Graphics overlay mark is set to an off (S103) by picture reproducer 101.Then, picture reproducer 101 are repeated the processing of step S101~S103, until image reproduction is completed or has reproduction to stop operation (S104).For example, The processing is repeated with 1 frame unit or multiframe unit.
Figure 11 B is the flow chart for indicating the movement of image display 102.What image display 102 was shown in image Start tone mapping processing while beginning.At this point, image display 102 determines that Graphics overlay mark is ON or OFF (S111).In the case where Graphics overlay mark is OFF ("No" in S111), image display 102 by switching part SW1 and SW2 is connected to A, is handled by carrying out the tone mapping based on main image dynamic metadata, and tone mapping is updated (S112). That is, coefficient operational part 131 calculates tone mapping coefficient, tone mapping portion 133 based on the main image dynamic metadata at current time For the image at current time, tone mapping processing is carried out using calculated tone mapping coefficient.At this point, coefficient retaining unit 132 keep new calculated tone mapping coefficient.
If Graphics overlay mark becomes ON ("Yes" in S111), image display 102 by by switching part SW1 and SW2 is connected to B, and tone mapping is fixed (S113).Specifically, by the way that the input terminal of coefficient retaining unit 132 is connected to The output terminal of itself, coefficient retaining unit 132 keep switching part SW2 will be from A as the tone mapping coefficient before B.In addition, Since switching part SW1 is connected to B, so the tone mapping coefficient used in tone mapping portion 133 is fixed.As a result, not There is the time fluctuation of tone mapping again.
In addition, if Graphics overlay mark becomes OFF ("No" in S111), then start the time fluctuation of tone mapping coefficient (S112).The processing of these S111~S113 is repeated, until the operation for finishing receiving or making display OFF of image (S114).For example, the processing is repeated with 1 frame unit or multiframe unit.
As above, the image display system 100 in relation to present embodiment, which has, carries out using most light with image Spend the tone mapping processing unit 123 and display tone that corresponding conversion curve handles the tone mapping of the luminance transformation of image The display unit 124 of mapping treated image.The switching of tone mapping processing unit 123 is the time sequence according to the maximum brightness of image The 1st tone mapping processing (S112) that the variation of column changes conversion curve with time series, is still not dependent on image most The variation of the time series of big brightness and carry out handling (S113) using the 2nd tone mapping of certain conversion curve.
As a result, such as can according to switch the classification of image be by the conversion curve used in tone mapping with when Between sequence change or fixed.Thereby, it is possible to the classifications etc. according to image, are to carry out optimal tone at each moment to reflect to switch It penetrates, or inhibits would otherwise be the brightness change of certain image by fixing tone mapping.In this way, image display system 100 can be improved the quality of the image of display.
In addition, image display system 100 is also equipped with the combining unit for generating image and figure is synthesized in main image (main image combining unit 118 and figure combining unit 117).Tone mapping processing unit 123 does not have the feelings of synthesising pattern in main image Under condition ("No" in S111), the 1st tone mapping processing (S112), (S111 in the case where figure has been synthesized in main image are carried out Middle "Yes"), carry out the 2nd tone mapping processing (S113).Thereby, it is possible to inhibit the variation of the brightness of figure.
In addition, combining unit generates the 1st mark (Graphics overlay mark) for indicating whether to have synthesized figure in main image.Color Adjust mapping processing unit 123 according to the 1st mark, decision is to carry out the processing of the 1st tone mapping or carry out the processing of the 2nd tone mapping.
In addition, figure includes subtitle and menu, the 1st mark includes indicating the 2nd of subtitle whether has been synthesized in main image Whether mark (subtitle superposition mark) and expression have synthesized the 3rd mark (menu superposition mark) of menu in main image.By This, in the case where the case where being superimposed subtitle and being superimposed menu, is able to carry out the tone mapping being suitble to respectively with it and handles.
For example, tone mapping processing unit 123 is being switched to the case where the 2nd tone mapping is handled from the processing of the 1st tone mapping Under, the nearest conversion curve in the processing of the 2nd tone mapping, before continuing to use.Thereby, it is possible to inhibit from the 1st tone Brightness significantly changes in the switching that mapping processing is handled to the 2nd tone mapping.
For example, as shown in Figure 10, tone mapping processing unit 123A the 2nd tone mapping processing in, for boundary luminances with On brightness conversion curve is changed in temporal sequence according to the variation of the time series of the maximum brightness of image, for less than The brightness of boundary luminances, no matter how the variation of the time series of the maximum brightness of image all uses certain conversion curve.
Accordingly, for brightness more than boundary luminances, optimal tone mapping is able to carry out at each moment, and for not Brightness to boundary luminances is able to suppress brightness change.
It carries out in addition, the image display 102 in relation to present embodiment has using corresponding with the maximum brightness of image Conversion curve will the luminance transformation of image tone mapping processing tone mapping processing unit 123 and display tone mapping at The display unit 124 of image after reason.The switching of tone mapping processing unit 123 is the time series for carrying out the maximum brightness according to image Variation the 1st tone mapping processing (S112) of changing conversion curve with time series, no matter or carrying out the maximum of image How the variation of the time series of brightness all handles (S113) using the 2nd tone mapping of certain conversion curve.
As a result, such as the classification according to image, switching is by the conversion curve used in tone mapping with time sequence Column change is still fixed.It is that optimal tone mapping is carried out at each moment thereby, it is possible to be switched according to classification of image etc., also It is to inhibit would otherwise be the brightness change of certain image by fixing tone mapping.In this way, 102 energy of image display The quality of enough images for improving display.
In addition, carrying out the 1st in the case that tone mapping processing unit 123 does not include figure in image ("No" in S111) Tone mapping handles (S112), in the case where including figure in image ("Yes" in S111), carries out the processing of the 2nd tone mapping (S113).Thereby, it is possible to inhibit the variation of the brightness of figure.
In addition, tone mapping processing unit 123 is the processing of the 1st tone mapping of progress according to expression or carrying out the 2nd tone reflects The 1st mark (Graphics overlay mark) of processing is penetrated, decision is to carry out the processing of the 1st tone mapping or carry out at the 2nd tone mapping Reason.
In addition, the 1st mark includes indicating whether the 2nd comprising subtitle indicates (subtitle superposition mark) and indicate in image Whether the 3rd comprising menu indicates (menu superposition mark) in image.The case where being superimposed subtitle and menu has been superimposed it as a result, In the case where, it is able to carry out the tone mapping being suitble to respectively with it and handles.
[3. embodiment 2]
In the present embodiment, other than the processing of embodiment 1, picture reproducer 101 will also be folded to main image A part implantation of the luminance information of the figure added to dynamic metadata.Image display 102 is based on menu superposition mark The luminance information of state and figure makes the On/Off or its Strength Changes of dynamic tone mapping.Thereby, it is possible to reduce dynamic tone Map the influence to the figure of superposition.
[3-1. structure]
The point below of picture reproducer 101 in relation to present embodiment is different from embodiment 1.Figure shown in Fig. 7 Graphics overlay mark is set as ON, and extract as figure in the case where being superimposed graphical information to main image by combining unit 117 Luminance information figure luminance information, the figure luminance information extracted is transmitted to image unloading part 119.Image unloading part 119, using figure luminance information as a part of dynamic metadata, send out to image display 102.Figure combining unit 117 is made Preset fixed value both can be used for figure luminance information, luminance information can also be extracted from graphical information every time, Figure luminance information can also be obtained by referring to the metadata provided by other mechanisms.
In addition, figure luminance information also may include the luminance information of subtitle and the luminance information of menu.
The point below of image display 102 in relation to present embodiment is different from embodiment 1.Member number shown in Fig. 7 Figure luminance information is also obtained other than main image dynamic metadata and Graphics overlay mark according to acquisition unit 122, these are believed It ceases and is transmitted to tone mapping processing unit 123.The detailed construction of tone mapping processing unit 123 is, for example, structure shown in Fig. 10, tool Standby coefficient combining unit 134.For coefficient combining unit 134, tablet pattern luminance information, coefficient are gone back other than Graphics overlay mark Combining unit 134 handled using the synthesis of the tone mapping coefficient of the luminance information of figure.For example, coefficient combining unit 134 is right In the brightness below of figure luminance information, change tone mapping in time.That is, coefficient combining unit 134 is used as embodiment party The boundary luminances of formula 1 and use figure luminance information.
In addition, coefficient combining unit 134 can also show boundary luminances based on image in embodiment 1 and embodiment 2 The setting etc. of showing device 102 is adjusted.Equally, picture reproducer 101 may not be by figure luminance information as former state to Image display 102 transmits, but in the type of the image based on environment, reproduction or the hobby of user etc. by figure brightness After information adjustment, transmitted to image display 102.By these, influence journey of the dynamic tone mapping to figure can be adjusted Degree and to the adaptedness of main image.
Figure luminance information also may include subtitle brightness information and menu luminance information.In the case, coefficient synthesizes Portion 134 and embodiment 1 are same, can also change the synthetic method of dynamic tone mapping in subtitle and menu.
Figure 12 A is the main shadow for indicating to transmit from picture reproducer 101 to image display 102 in the present embodiment As the figure of dynamic metadata, the structural example of Graphics overlay mark and figure luminance information.Figure luminance information for example indicates scheming Maximum brightness used in shape.For example, main image dynamic metadata indicates the maximum brightness of 1 frame unit or multiframe unit and is averaged Brightness.
Figure 12 B is the other structures example for indicating main image dynamic metadata, Graphics overlay mark and figure luminance information Figure.As shown in Figure 12 B, figure luminance information also may include the maximum brightness of subtitle and the maximum brightness of menu.
In addition it is also possible to including the purposes of Graphics overlay mark in figure luminance information.It is bright that for example, it can be figures The a part or specific value for spending information indicate that Graphics overlay mark is OFF, indicate that Graphics overlay mark is ON by other values.
Figure 13 A is that the main image for indicating to transmit from picture reproducer 101 in this case to image display 102 is moved The figure of state metadata and the structural example of figure luminance information.In the example shown in Figure 13 A, figure luminance information is by 8 bit structures At indicating the brightness of 0-1020nit.Value 0 indicates that figure exists but brightness is unclear, and value 1 indicates that figure is not present, other It is worth the brightness that 4nit unit is indicated from 8nit to 1020nit.In addition, bit architecture, brightness about figure luminance information Range, 0,1 and other values meaning, however it is not limited to this, systems requirements can be matched with and changed.
In addition, as shown in Figure 13 B, in the case where figure luminance information includes subtitle brightness information and menu luminance information Also it can similarly constitute.
[3-2. effect]
Figure 14 A is the brightness by previous dynamic tone mapping bring subtitle indicated in the case that figure is subtitle The figure of variation.In the case where the luminance level of subtitle is 200nit situation below, if tone mapping changes in time, basis Figure 14 A is that the brightness of certain subtitle changes originally it is found that the brightness near from 0 to 200nit also changes.
In contrast, in the embodiment 1, brightness below for defined boundary luminances enables to that color does not occur Adjust the time change of mapping.As a result, according to Figure 14 B it is found that not as the 200nit of subtitle brightness time change below, with Stable brightness shows subtitle.Here, boundary luminances are, for example, the fixed value higher than the luminance level of the subtitle of standard, and transformation is bent The turning point (knee point) of line is also fixed.
But if boundary luminances are fixed, the amplitude of variation of dynamic tone mapping is limited, and for main image, is had The project that the effect of dynamic tone mapping becomes smaller.In particular, being asked when the maximum brightness (DPL) of image display 102 is lower It inscribes more significant.Certainly, in image display 102, the brightness of graph data is envisioned for certain value or less by studying Etc. dynamics tone mapping method, be capable of increasing the effect of dynamic tone mapping.But in the case, display imagine with On brightness graph data in the case where, there is the display of graph data to be easy the class of influence by dynamic tone mapping etc. Topic.
In contrast, changing boundary luminances in embodiment 2 in order to the luminance information based on subtitle, such as scheme It, can be to the higher dynamic tone mapping of main image application freedom degree shown in 15.In Figure 15, the bright of actual subtitle is illustrated The case where degree is 100nit.As shown in figure 15, in the case, for boundary luminances shown in Figure 14 B are fixed as 200nit And the case where handling, it can be realized the higher dynamic tone mapping of freedom degree.The maximum brightness of the image display 102 of connection Lower, the effect is bigger.
[the detailed structural example of 3-3.]
In the present embodiment, it illustrates to believe the brightness for the figure being superimposed to main image in picture reproducer 101 Breath is implanted in a part of dynamic metadata, illustrates the example of the method for the implantation.
In the encapsulation medium as Blu-ray disk, by image reproduction, by continuous 1 reproduction paths It is defined as the file of playlist, is recorded on disk.Playlists records have which of video stream on disk is reproduced, its again The playback management information of existing starting position, completion position or recovery time etc..
In the playlist, the luminance information for the figure that record is shown simultaneously with main image or the upper limit of brightness range are believed Breath.Picture reproducer 101 can easily obtain the luminance information or brightness model of the figure displaying together with main image as a result, The upper-limit information enclosed transmits acquired information to image display 102.
In addition, figure luminance information also may include subtitle brightness information and menu luminance information.In addition, can be from more In the case where kind language or multiple versions selection subtitle or menu, figure luminance information also be may include and multilingual or version Corresponding multiple subtitle brightness information or multiple menu luminance informations.In this case as well, it is possible to by multiple subtitle brightness information Or multiple menu luminance information records are in the play list.
In turn, figure luminance information can also be not only the maximum brightness in the reproduction of the playlist, also by each field Scape or maximum brightness per unit time indicate together with playback time information.
In addition, being also possible to the MaxSLL recorded in Figure 15 to the figure luminance information that the playlist saves.It should MaxSLL is at least the one of the minimum brightness of the maximum brightness for the figure being superimposed to main image and the dynamic tone mapping of main image Side.
In addition, the details of Blu-ray, Ultra HD Blu-ray are for example recorded in non-patent literature 1.
As above, in the present embodiment, tone mapping processing unit 123A is bright according to the brightness settings boundary of figure Degree.As a result, since boundary luminances appropriate can be set according to classification of figure etc., so can expand can apply dynamic color Adjust the brightness range of mapping.
[4. embodiment 3]
Image display 102 in relation to present embodiment is other than the image display 102 of embodiment 1, also The position of the figure in main image is superimposed upon using detections such as interframe correlations.Image display 102 is for no superposed graph Pixel without dynamic tone mapping, and apply the tone mapping of not time fluctuation.Thereby, it is possible to reduce dynamic tone to reflect Penetrate the influence to figure.
Hereinafter, illustrating the structure of the image display system 100 in relation to present embodiment.The structure of picture reproducer 101 It is same with embodiment 1.In addition, picture reproducer 101, which also has, can not also possess Graphics overlay mark to image The case where function that display device 102 transmits.
The structure for the tone mapping processing unit 123B that image display 102 has is different from embodiment 1.Figure 16 is table It is shown with the block diagram for closing the structure of tone mapping processing unit 123B of present embodiment.Tone mapping processing unit 123B shown in Figure 16 Test pattern portion 135 is also equipped with other than the structure of tone mapping processing unit 123A shown in Fig. 10.
To 135 input image signal of test pattern portion.Test pattern portion 135 is superimposed with figure using interframe correlation etc., detection The location of pixels of shape.Also, test pattern portion 135 synthesizes the information for indicating whether the pixel unit for being superimposed with figure to coefficient Portion 134 exports.
In the case where Graphics overlay mark is ON, coefficient combining unit 134 is not for being applied the pixel of figure, by base It exports in the tone mapping coefficient of main image dynamic metadata to tone mapping portion 133, for being superimposed with the pixel of figure, will not have The tone mapping coefficient of having time variation is exported to tone mapping portion 133.
In addition, in the case where not carrying out Graphics overlay mark from the transmission of picture reproducer 101, coefficient combining unit 134 Using the information for whether being superimposed with figure of the pixel unit detected by test pattern portion 135, tone mapping coefficient is carried out Synthesis.That is, coefficient combining unit 134 can also make Graphics overlay mark based on the output signal in test pattern portion 135.
For example, being detected in the frame of process object or frame group in test pattern portion 135 in 1 pixel or preset There are in the case where figure in the pixel of pixel number, coefficient combining unit 134 thinks to be superimposed with figure, and Graphics overlay mark is set as ON and handled.
In the case, tone mapping portion 133 accounts for bring time processing time because of test pattern portion 135 The processing of delay.For example, the time delay is preset in tone mapping portion 133.
In addition, tone mapping portion 133 can also be more than preset threshold value in the pixel number gone out as test pattern In the case where be determined to have figure.Thereby, it is possible to inhibit the error detection of figure.In addition, above-mentioned threshold value can also can be by making User's change.
As above, tone mapping processing unit 123B detects the graphics field for being superimposed with figure in image, for figure Shape region carries out the processing of the 2nd tone mapping, carries out the processing of the 1st tone mapping for the region other than the graphics field in image. Tone mapping can be fixed accordingly, for figure, and dynamic tone mapping is able to carry out for the region other than figure.
[5. embodiment 4]
Different from embodiment 1, in the present embodiment, picture reproducer 101A does not generate Graphics overlay mark, shadow As display device 102 does not have the function based on Graphics overlay mark change dynamic tone mapping.Instead of, picture reproducer 101A is carried out the processing of the luminance transformation of figure.
Specifically, the image display dress being connected on picture reproducer 101A for picture reproducer 101A setting Set 102 maximum brightness information.Picture reproducer 101A changes the brightness of the figure of superposition according to the maximum brightness information, So that the influence of the tone mapping carried out by image display 102 minimizes.Thereby, it is possible to reduce dynamic tone mapping to folded The influence of the figure added.
Picture reproducer 101A can both obtain the maximum brightness of image display 102 by the setting of operator Information, can also the EDID on the HDMI by being connected to picture reproducer 101A obtained from image display 102.Due to The method of the tone mapping carried out by image display 102 is various, so picture reproducer 101A is by figure Brightness be adjusted within the scope of some.Picture reproducer 101A both can carry out the adjustment based on the operation of operator, It can also be carried out based on the information obtained from the database of each image display 102.
Hereinafter, illustrating the structure of the picture reproducer 101A in relation to present embodiment.Figure 17 is to indicate this related implementation The block diagram of the structure of the picture reproducer 101A of mode.Picture reproducer 101A is in addition to related embodiment shown in Figure 17 Other than the structure of 1 picture reproducer 101, it is also equipped with maximum brightness configuration part 141 and luminance transformation portion 142.
Maximum brightness configuration part 141 obtains and keeps the maximum brightness information of image display 102.For example, the maximum Luminance information can also be set based on the operation of user, can also be used as the image being connected on picture reproducer 101A The attribute information of display device 102 and via video signal transfer device obtain.For example, maximum brightness configuration part 141 can also be with The maximum brightness information of image display 102 is obtained as the EDID of HDMI.Alternatively, maximum brightness configuration part 141 The attribute information of image display 102 can be obtained from the database of the server on network.
It will be inputted from the graphical information that figure combining unit 117 generates to luminance transformation portion 142.Luminance transformation portion 142 is based on It is maintained at the maximum brightness information of the image display 102 in maximum brightness configuration part 141, the brightness of graphical information is become It changes, transformed graphical information is transmitted to main image combining unit 118.Main image combining unit 118 is by transformed graphical information It is superimposed to main image.
For example, image display 102 maximum brightness be 500nit, graphical information maximum brightness be 300nit In the case of, the maximum brightness of graphical information is transformed to the maximum brightness as image display 102 by luminance transformation portion 142 50% 250nit.Thereby, it is possible to reduce the influence of the tone mapping of image display 102.
In addition, (above-mentioned 50%) is not limited to above-mentioned for the condition and ratio of transformation.In addition, they can also be by user Change, can also be matched with the characteristic of the image display 102 of connection and change.
As above, the image display system 100 in relation to present embodiment has display unit 124, by according to display The maximum brightness in portion 124 luminance transformation of the 1st image is generated the 2nd image luminance transformation portion 142 and carry out by using The luminance transformation of 2nd image is generated the tone mapping of the 3rd image by conversion curve corresponding with the maximum brightness of the 2nd image The tone mapping processing unit 123 of processing, display unit 124 show the 3rd image.Thereby, it is possible to inhibit the variation band by tone mapping The variation of the brightness come.
Specifically, luminance transformation portion 142 by will include in above-mentioned 1st image according to the maximum brightness of display unit 124 Figure luminance transformation, generate above-mentioned 2nd image.Thereby, it is possible to inhibit the variation of the brightness of figure.
[6. embodiment 5]
Different from embodiment 4, in the present embodiment, picture reproducer 101B assumes in image display 102 The method of dynamic tone mapping the dynamic color in image display 102 is implemented to the figure of superposition before superposed graph Adjust the inverse transformation of mapping.Thereby, it is possible to the figures that will be superimposed after implementing dynamic tone mapping with original brightness and color into Row display.
For example, picture reproducer 101B assumes the dynamic color of the image display 102 of connection by means below The method for adjusting mapping.Simply, picture reproducer 101B is shown as impregnable maximum brightness by reaching image The information such as the brightness of 90% image of the maximum brightness of device 102 corresponds to.More particularly, picture reproducer 101B obtains the dynamic tone mapping method of image display 102 from database.Alternatively, picture reproducer 101B uses survey Sample formula measures, the method for calculating dynamic tone mapping based on measurement result.
Hereinafter, illustrating the structure of the picture reproducer 101A in relation to present embodiment.Figure 18 is to indicate this related implementation The block diagram of the structure of the picture reproducer 101B of mode.
Picture reproducer 101B shown in Figure 18 is relative to the picture reproducer in relation to embodiment 4 shown in Figure 17 101A has tone map information maintaining part 143 instead of maximum brightness configuration part 141.In addition, will be from metadata acquisition unit The main image dynamic metadata of 116 outputs is sent to luminance transformation portion 142.
Tone map information maintaining part 143 keeps the tone mapping that the tone mapping about image display 102 is handled Information.Luminance transformation portion 142 uses the tone map information and main image dynamic metadata, implements to be shown by image to graphical information The inverse transformation for the tone mapping that showing device 102 carries out, the graphical information after inverse transformation is exported to main image combining unit 118.It is main Image compounding portion 118 implements the figure after the inverse transformation of tone mapping to main image superposition.
It, will be by the case where having carried out tone mapping in the image display 102 for receiving video signal as a result, Visuals after the inverse transformation of tone mapping is as original graphical display.Thereby, it is possible to reduce image display 102 The influence of tone mapping.
Figure 19 is the figure for indicating an example of the tone mapping used by image display 102.Figure 20 is to indicate the situation Under tone map information an example figure.For example, tone map information includes the luminance information and shadow of image display 102 As the tone map information of display device 102.The luminance information of image display 102 indicates image display 102 most Big brightness and as can show maximum brightness to the full frame for the maximum brightness that both full-pixel is shown simultaneously.In addition, image is shown The tone map information of device 102 indicates between the turning point in tone mapping, such as the brightness or turning point of expression turning point The increment of slope.
In addition, the structure of tone map information be not limited to it is above-mentioned.For example, tone map information can also be only comprising figure The information of a part in information shown in 20.
In addition, (such as above-mentioned 90%) both may be used for the condition or ratio of the inverse transformation of the tone mapping of image display 102 To be changed by user, can also be changed according to the image display 102 of connection.
In addition, picture reproducer 101B can both obtain the color of image display 102 by the setting of user Adjust map information, can also be used as the attribute for the image display 102 being connected on picture reproducer 101B and via shadow As apparatus for transmitting signal obtains.For example, picture reproducer 101B can also obtain EDID of the tone map information as HDMI. Alternatively, picture reproducer 101B can also obtain the image display 102 of connection from the database of the server on network Attribute information.
As above, the image display system 100 in relation to present embodiment has by by the luminance transformation of the 1st image And the luminance transformation portion 142 of the 2nd image of generation, progress will by using conversion curve corresponding with the maximum brightness of the 2nd image The luminance transformation of 2nd image and generate the 3rd image tone mapping processing tone mapping processing unit 123 and display the 3rd The display unit 124 of image.Luminance transformation portion 142 is handled according to the tone mapping carried out by tone mapping processing unit 123, by the 1st The luminance transformation of image.Thereby, it is possible to inhibit by the variation of the variation bring brightness of tone mapping.
Specifically, maximum brightness of the luminance transformation portion 142 based on the 1st image and by tone mapping processing unit 123 into Conversion curve used in capable tone mapping processing, by the luminance transformation of the 1st image.
[7. variation]
The HDR image that acquisition unit 111 obtains is also possible to the moving image hair of such as Blu-ray disk, DVD, Internet Image in cloth website, broadcast or HDD (Hard Disk Drive).
Above-mentioned picture reproducer is also possible to disk player, disk logger, set-top box, TV, personal computer or intelligence Energy phone etc. is transmitted the video signal decoding of the compression from recording medium, broadcast or internet and to image display Device.In addition it is also possible to be the function of picture reproducer part or all be included in image display 102 in. For example, it is also possible to which the processing unit other than the acquisition unit 111 in the processing unit for including in picture reproducer is shown included in image In showing device 102.In addition it is also possible to be the image receiving unit 121 for including, metadata acquisition unit 122 in image display 102 And tone mapping processing unit 123 is included in picture reproducer.In addition it is also possible to by including in tone mapping processing unit 123 Processing unit in tone mapping portion 133 other than processing unit be included in picture reproducer in.
Future, the video signal transport mechanism that transmits to image display of video signal of self imaging transcriber both might be used To be the mechanism for transmitting the video signal of HDMI, DVI or DP etc. with uncompressed state, it is also possible to such as the biography by network Send the mechanism that will have compressed the form transmission of video signal like that.
Setting of the maximum brightness information or tone map information of image display to picture reproducer can also lead to It crosses user and is carried out using remote controler etc. to picture reproducer input, picture reproducer can also be used by user The operating device having inputs to carry out.Alternatively, internet also can be used by user or other mechanisms obtain these information, it will Acquired information is saved to type portable storage medium, transmits these information to picture reproducer via type portable storage medium. In addition it is also possible to which picture reproducer is directly connected on the internet, picture reproducer is obtained from the database of server These information.In turn, picture reproducer can also show test pattern on image display, on one side using shown Test pattern confirms the characteristic of image display, obtains and store on one side these information.
The tone map information of image display instantiates the case where turning point is at two in embodiment 5, but It can be defined with the turning point more than at 3, it can also be by curve definitions.
Picture reproducer can also be by generating figure according to the brightness of its Data Detection figure (subtitle or menu) Luminance information (including subtitle brightness information and menu luminance information) can also obtain the pre-production in image data production The brightness of figure.For example, the brightness of figure can be both recorded in disk, can also be used as metadata by broadcast or Internet is sent.Picture reproducer reads the brightness of figure, and a part as dynamic metadata is shown to image to be filled Set transmission.Alternatively, remembering in the database for the server being connected on Internet as the information for the content of reproduction The luminance information of figure (subtitle or menu) is recorded, picture reproducer obtains the luminance information of figure from the database, will be taken The luminance information obtained is sent to image display.
More than, the image display system in relation to embodiment of the present disclosure is illustrated, but the disclosure does not limit In the embodiment.
In addition, everywhere in including in the image display system in relation to above embodiment reason portion typically can be used as it is integrated Circuit, that is, LSI is realized.Both their individually 1 chips can also be may include part or all and 1 chip.
In addition, integrated circuit is not limited to LSI, can also be realized by special circuit or general processor.It can also benefit Used in LSI manufacture after can program FPGA (Field Programmable Gate Array: field programmable gate array), Or the reconfigurable processor of connection and the setting of circuit unit inside LSI can be reconstructed.
In addition, in the respective embodiments described above, each component can also be made of dedicated hardware, or pass through execution It is suitable for the software program of each component to realize.Each component can also be executed by the program of CPU or processor etc. Software program in the recording medium for being recorded in hard disk or semiconductor memory etc. is read and executed and is realized by portion.
It is realized in addition, the disclosure can also be used as by the various methods that image display system executes.
In addition, the division of the functional block in block diagram is an example, can also be realized multiple functional blocks as a functional block, Or a functional block is divided into multiple, or part of functions is transferred in other function block.In addition it is also possible to will have class As the function of multiple functional blocks of function handled with dividing by single hardware or software parallel or time.
In addition, the sequence that each step in flow chart is performed is illustrated to specifically describe the disclosure, it can also To be sequence other than the above.In addition it is also possible to which a part of above-mentioned steps (parallel) is executed simultaneously with other steps.
More than, the image display system in relation to one or more technical solutions is illustrated based on embodiment, but The disclosure is not limited to the embodiment.Without departing from the purport of the disclosure, art technology is implemented to present embodiment Form after the various modifications that personnel expect combines the constituent element of different embodiments and the form that constructs also can also be with It is also contained in the range of one or more technical solutions.
Industrial availability
The disclosure can be to image display system, picture reproducer or image display application.
Label declaration
100 image display systems
101,101A, 101B picture reproducer
102 image displays
111 acquisition units
112 demultiplexers
113 main image lsb decoders
114 caption decoding portions
115 menu lsb decoders
116,122 metadata acquisition unit
117 figure combining units
118 main image combining units
119 image unloading parts
121 image receiving units
123,123A, 123B tone mapping processing unit
124 display units
131 coefficient operational parts
132 coefficient retaining units
133 tone mapping portions
134 coefficient combining units
135 test pattern portions
141 maximum brightness configuration parts
142 luminance transformation portions
143 tone map information maintaining parts

Claims (9)

1. a kind of image display system, which is characterized in that
Have:
Tone mapping processing unit, carries out tone mapping processing, and tone mapping processing uses corresponding with the maximum brightness of image Conversion curve converts the brightness of above-mentioned image；And
Display unit shows above-mentioned tone mapping treated image；
Above-mentioned tone mapping processing unit to be carry out the 1st tone mapping processing or carry out the 2nd tone mapping processing switch over, The processing of 1st tone mapping changes above-mentioned change according to the variation of the time series of the maximum brightness of above-mentioned image in temporal sequence Curve is changed, the processing of the 2nd tone mapping and the variation of the time series of the maximum brightness of above-mentioned image independently use certain Conversion curve.
2. image display system as described in claim 1, which is characterized in that
Above-mentioned image display system is also equipped with the combining unit that above-mentioned image is generated and to main image synthesising pattern；
Above-mentioned tone mapping processing unit reflects in above-mentioned main image without carrying out above-mentioned 1st tone in the case where synthesis above-mentioned figure Processing is penetrated, above-mentioned 2nd tone mapping processing is carried out in the case that synthesis has above-mentioned figure in above-mentioned main image.
3. image display system as claimed in claim 2, which is characterized in that
Above-mentioned combining unit generates the 1st mark for indicating whether to have synthesized above-mentioned main image above-mentioned figure；
For above-mentioned tone mapping processing unit according to above-mentioned 1st mark, decision is to carry out above-mentioned 1st tone mapping processing or carry out State the processing of the 2nd tone mapping.
4. image display system as claimed in claim 3, which is characterized in that
Above-mentioned figure includes subtitle and menu；
Above-mentioned 1st mark includes indicating whether to have synthesized the 2nd mark of above-mentioned subtitle in above-mentioned main image and indicating above-mentioned Whether 3rd mark of above-mentioned menu has been synthesized in main image.
5. image display system as described in any one of claims 1 to 4, which is characterized in that
Above-mentioned tone mapping processing unit is being switched to the case where above-mentioned 2nd tone mapping is handled from the processing of above-mentioned 1st tone mapping Under, the nearest conversion curve in the processing of above-mentioned 2nd tone mapping, before continuing to use.
6. image display system as claimed in claim 2, which is characterized in that
Above-mentioned tone mapping processing unit above-mentioned 2nd tone mapping processing in,
For brightness more than boundary luminances, according to the variation of the time series of the maximum brightness of above-mentioned image, in temporal sequence Change above-mentioned conversion curve；
For the brightness less than above-mentioned boundary luminances, the variation with the time series of the maximum brightness of above-mentioned image independently makes With certain conversion curve.
7. image display system as claimed in claim 6, which is characterized in that
Above-mentioned tone mapping processing unit is according to the above-mentioned boundary luminances of brightness settings of above-mentioned figure.
8. image display system as claimed in claim 2, which is characterized in that
Above-mentioned tone mapping processing unit,
Detect the graphics field for being superimposed with above-mentioned figure in above-mentioned image；
Above-mentioned 2nd tone mapping processing is carried out for above-mentioned graphics field；
For the region other than the above-mentioned graphics field in above-mentioned image, above-mentioned 1st tone mapping processing is carried out.
9. a kind of image display method is the image display method in image display system, which is characterized in that
Include:
Tone mapping processing step, carries out tone mapping processing, and tone mapping processing uses corresponding with the maximum brightness of image Conversion curve the brightness of above-mentioned image is converted；And
It shows step, shows above-mentioned tone mapping treated image；
In above-mentioned tone mapping processing step, to be carry out the 1st tone mapping processing or carry out the 2nd tone mapping processing carry out Switching, the processing of the 1st tone mapping are changed in temporal sequence according to the variation of the time series of the maximum brightness of above-mentioned image Conversion curve is stated, the processing of the 2nd tone mapping and the variation of the time series of the maximum brightness of above-mentioned image independently use one Fixed conversion curve.
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